Seyyed Mohammad Hosseini (Persian: سید محمد حسینی; 21 February 1983 – 7 January 2023) was a 39-year-old Iranian man who was executed by Iran's Islamic Republic for his participation in the Mahsa Amini protests.

He was found guilty of Fisad-e-filarz (an Arabic term translating to "corruption on Earth") for his alleged involvement in the murder of a Basij militiaman during demonstrations in Karaj during the 40th-day memorial of Hadis Najafi.

According to Masoud Setayeshi, spokesperson for the Iranian judiciary, a gang of individuals referred to as "rioters" followed Ajamian with knives and stones, stripped him naked, and murdered him during a rally commemorating the 40th anniversary of Hadis Najafi's death.

In connection with Ajamian's death, Iranian officials apprehended sixteen people: thirteen adult males, including Seyyed Mohammad Hosseini, and three juvenile boys.

Neither Hosseini nor Karami were formally charged with first-degree murder but rather with vague accusations that the Islamic Republic authorities often employ against political detainees.

In the state-media video from the court, however, this sentence was only said by another defendant, while Seyyed Mohammad Hosseini strongly maintained his innocence.

"[13] Following the killings of Hosseini and Karami, the UN High Commissioner for Human Rights (OHCHR) asked Iran to "halt all executions."

"We deplore the execution of two more protestors, #MohammadMehdiKarami & #SeyyedMohammadHosseini, following unfair trials based on forced confessions," the OHCHR tweeted on 7 January 2023.

[14][15] In a statement, Iran Human Rights director Mahmoud Amiry-Moghaddam said, "The executions are an extension of the killing of defenceless protesters in prison and have no legal basis.

It urged Iranian authorities to "immediately put an end to the highly reprehensible practice of... carrying out death sentences" and to "cancel without delay" any scheduled executions.